Interleukin-4 enhances murine bone marrow macrophage M-CSF receptor expression by a posttranscriptional mechanism.
Lymphokine Cytokine Res
; 13(2): 85-92, 1994 Apr.
Article
in En
| MEDLINE
| ID: mdl-8061119
ABSTRACT
Activated T-lymphocytes secrete interleukin-4 (IL-4), which has been shown to modulate a variety of monocyte activities requiring monocyte/macrophage colony-stimulating factor (M-CSF). To account for this interaction, we postulated that IL-4 acts on target cells by altering the expression of the M-CSF receptor (M-CSFr). To test this hypothesis, murine bone marrow macrophages were cultured under conditions that down-regulate M-CSFr and the effect of IL-4 on the reexpression of the receptor measured by binding of 125I-labeled M-CSF to the cells. The data show that incubation with IL-4 results in a dose-dependent, 2-3 x increase in M-CSFr with no change in binding affinity and a maximal effect on binding at about 12 h. This increase in M-CSFr is dependent upon new, specific protein synthesis as shown by the inhibitory action of cycloheximide, and gel analysis of radiolabeled, specific protein, immunoprecipitated with anti-M-CSFr antibody. Treatment with IL-4 does not stimulate M-CSFr mRNA expression but, consistent with enhanced receptor levels, does result in a heightened proliferative response to M-CSF. Thus, IL-4 affects M-CSF treated monocytic cells, at least in part, by altering the expression of M-CSFr.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Interleukin-4
/
Receptor, Macrophage Colony-Stimulating Factor
/
Macrophages
Limits:
Animals
Language:
En
Journal:
Lymphokine Cytokine Res
Journal subject:
ALERGIA E IMUNOLOGIA
Year:
1994
Document type:
Article